Umbrella stick



FIG. 1 is a perspective view showing my new design for an umbrella stick;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a perspective view of the umbrella stick in an unclaimed usage configuration, with broken lines added for illustrative clarity; and,

FIG. 9 is a perspective view of the umbrella stick in an unclaimed usage configuration, with broken lines added for illustrative clarity.

The broken away symbols in the drawings indicate that any portion of the article beyond what is shown forms no part of the claimed design.

The broken lines shown in the drawings are for the purpose of illustrating unclaimed portion of the umbrella stick and unclaimed environmental structure and form no parts of the claimed design. 

CLAIM The ornamental design for an umbrella stick, as shown and described. 